1 //===-- TestModuleFileExtension.cpp - Module Extension Tester -------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 #include "TestModuleFileExtension.h"
10 #include "clang/Frontend/FrontendDiagnostic.h"
11 #include "clang/Serialization/ASTReader.h"
12 #include "llvm/ADT/Hashing.h"
13 #include "llvm/Bitcode/BitstreamWriter.h"
14 #include "llvm/Support/raw_ostream.h"
15 #include <cstdio>
16 using namespace clang;
17 using namespace clang::serialization;
18
~Writer()19 TestModuleFileExtension::Writer::~Writer() { }
20
writeExtensionContents(Sema & SemaRef,llvm::BitstreamWriter & Stream)21 void TestModuleFileExtension::Writer::writeExtensionContents(
22 Sema &SemaRef,
23 llvm::BitstreamWriter &Stream) {
24 using namespace llvm;
25
26 // Write an abbreviation for this record.
27 BitCodeAbbrev *Abv = new llvm::BitCodeAbbrev();
28 Abv->Add(BitCodeAbbrevOp(FIRST_EXTENSION_RECORD_ID));
29 Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // # of characters
30 Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // message
31 auto Abbrev = Stream.EmitAbbrev(Abv);
32
33 // Write a message into the extension block.
34 SmallString<64> Message;
35 {
36 auto Ext = static_cast<TestModuleFileExtension *>(getExtension());
37 raw_svector_ostream OS(Message);
38 OS << "Hello from " << Ext->BlockName << " v" << Ext->MajorVersion << "."
39 << Ext->MinorVersion;
40 }
41 uint64_t Record[] = {FIRST_EXTENSION_RECORD_ID, Message.size()};
42 Stream.EmitRecordWithBlob(Abbrev, Record, Message);
43 }
44
Reader(ModuleFileExtension * Ext,const llvm::BitstreamCursor & InStream)45 TestModuleFileExtension::Reader::Reader(ModuleFileExtension *Ext,
46 const llvm::BitstreamCursor &InStream)
47 : ModuleFileExtensionReader(Ext), Stream(InStream)
48 {
49 // Read the extension block.
50 SmallVector<uint64_t, 4> Record;
51 while (true) {
52 llvm::BitstreamEntry Entry = Stream.advanceSkippingSubblocks();
53 switch (Entry.Kind) {
54 case llvm::BitstreamEntry::SubBlock:
55 case llvm::BitstreamEntry::EndBlock:
56 case llvm::BitstreamEntry::Error:
57 return;
58
59 case llvm::BitstreamEntry::Record:
60 break;
61 }
62
63 Record.clear();
64 StringRef Blob;
65 unsigned RecCode = Stream.readRecord(Entry.ID, Record, &Blob);
66 switch (RecCode) {
67 case FIRST_EXTENSION_RECORD_ID: {
68 StringRef Message = Blob.substr(0, Record[0]);
69 fprintf(stderr, "Read extension block message: %s\n",
70 Message.str().c_str());
71 break;
72 }
73 }
74 }
75 }
76
~Reader()77 TestModuleFileExtension::Reader::~Reader() { }
78
~TestModuleFileExtension()79 TestModuleFileExtension::~TestModuleFileExtension() { }
80
81 ModuleFileExtensionMetadata
getExtensionMetadata() const82 TestModuleFileExtension::getExtensionMetadata() const {
83 return { BlockName, MajorVersion, MinorVersion, UserInfo };
84 }
85
hashExtension(llvm::hash_code Code) const86 llvm::hash_code TestModuleFileExtension::hashExtension(
87 llvm::hash_code Code) const {
88 if (Hashed) {
89 Code = llvm::hash_combine(Code, BlockName);
90 Code = llvm::hash_combine(Code, MajorVersion);
91 Code = llvm::hash_combine(Code, MinorVersion);
92 Code = llvm::hash_combine(Code, UserInfo);
93 }
94
95 return Code;
96 }
97
98 std::unique_ptr<ModuleFileExtensionWriter>
createExtensionWriter(ASTWriter &)99 TestModuleFileExtension::createExtensionWriter(ASTWriter &) {
100 return std::unique_ptr<ModuleFileExtensionWriter>(new Writer(this));
101 }
102
103 std::unique_ptr<ModuleFileExtensionReader>
createExtensionReader(const ModuleFileExtensionMetadata & Metadata,ASTReader & Reader,serialization::ModuleFile & Mod,const llvm::BitstreamCursor & Stream)104 TestModuleFileExtension::createExtensionReader(
105 const ModuleFileExtensionMetadata &Metadata,
106 ASTReader &Reader, serialization::ModuleFile &Mod,
107 const llvm::BitstreamCursor &Stream)
108 {
109 assert(Metadata.BlockName == BlockName && "Wrong block name");
110 if (std::make_pair(Metadata.MajorVersion, Metadata.MinorVersion) !=
111 std::make_pair(MajorVersion, MinorVersion)) {
112 Reader.getDiags().Report(Mod.ImportLoc,
113 diag::err_test_module_file_extension_version)
114 << BlockName << Metadata.MajorVersion << Metadata.MinorVersion
115 << MajorVersion << MinorVersion;
116 return nullptr;
117 }
118
119 return std::unique_ptr<ModuleFileExtensionReader>(
120 new TestModuleFileExtension::Reader(this, Stream));
121 }
122